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Let's breakdown the technical details in Microsoft's mind blowing Lifelike audio-driven talking faces framework - VASA and model VASA-1:
Summary of Summaries - The paper introduces VASA, a framework for generating lifelike talking faces with appealing visual affective skills (VAS) from a single image and speech audio. - Core innovations include a diffusion-based model for holistic generation of facial dynamics and head movements in an expressive, disentangled face latent space developed using video data.. - VASA-1 Generates high-quality 512x512 videos at up to 40 FPS with low latency. - Supports real-time generation of lifelike, emotive talking faces.
Summary of Overall Framework: - VASA generates facial dynamics and head motion in latent space, conditioned on audio and other signals - Instead of directly generating video frames, it generates holistic facial dynamics and head motion in a latent space, conditioned on audio and optional signals. - To achieve this, the framework uses a face encoder-decoder to extract appearance and identity features and train a Diffusion Transformer model to generate motion latent codes.
Technical Method Details: Expressive and Disentangled Face Latent Space Construction: - Based on 3D-AID face reenactment framework - Decomposes face into 3D appearance volume, identity code, head pose, and facial dynamics latents - Uses encoders to extract these latent factors from face images. - Applies additional losses to improve disentanglement: - Pairwise head pose and facial dynamics transfer loss - Face identity similarity loss for cross-identity pose/dynamics transfer
Holistic Facial Dynamics Generation with Diffusion Transformer: - Represents all facial movements (lip, expression, gaze, etc.) as a single latent sequence - Applies a Diffusion Transformer model to generate the facial dynamics sequence. - Diffusion Transformer trained with simplified denoising score matching objective.